Malicious PDF — malware analysis report

Static analysis result for SHA-256 917751fc798356ca…

MALICIOUS

PDF

86.3 KB Created: 2021-06-02 15:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3755b57e316fe10f2f45a9f7a17070f SHA-1: c170ac1ed6ec7e0923e95df8d11dd550c1d0a001 SHA-256: 917751fc798356caf3a82bb37b5f2252840e2976841ca9ac2c385677858ea24b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to 'infrive.ru', suggesting an attempt to redirect the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/pbw?utm_term=grafico+tens%25C3%25A3o+deforma%25C3%25A7%25C3%25A3o+a%25C3%25A7o+1020
    • https://sipotumavawufu.weebly.com/uploads/1/3/4/8/134875946/4638659.pdf
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/5df86055cb.pdf
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/pezilikuj-kopojozuliv-nejovarima-lixipuvaderejur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vazesuna.pbworks.com/w/file/fetch/144509100/the_absolutely_true_diary_of_a_part-time_indian_chapter_1_questions.pdf
    • http://siseraxoru.pbworks.com/f/xugeza.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144477006/best_minecraft_mods_for_pocket_edition.pdf
    • http://visetululiv.pbworks.com/f/43942838024.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411678/survivor_39_episode_1_watch_online.pdf
    • http://sonopewobu.pbworks.com/f/grille_salaire_secrtaire_mdicale_2020_fonction_publique_hospitalire.pdf
    • http://fixiguru.pbworks.com/f/subway_surf_hile_apk_indir_son_srm_cretsiz.pdf
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425397/presidents_choice_5_cup_coffee_maker_manual.pdf
    • http://paditoxef.pbworks.com/f/20521138872.pdf
    • http://lipadune.pbworks.com/w/file/fetch/144414588/framaroot_apk_download_for_android_5.1.pdf
    • http://dibesusajob.pbworks.com/w/file/fetch/144440772/taporuwotowumuravi.pdf
    • http://zekodunu.pbworks.com/f/xuwibolosakax.pdf
    • http://lomexalipele.pbworks.com/w/file/fetch/144506235/41488330321.pdf
    • http://wuwazilizos.pbworks.com/f/61581734260.pdf
    • http://pezeliv.pbworks.com/f/kawasaki_kr_150_wiring_diagram.pdf
    • http://nuxawakaxaz.pbworks.com/f/46665060489.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe68.bin
458a774cc240fc14fade9900804076614afd85b61931a5209c97279f57b0413b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 5780 bytes
font_01_sfnt_off0001110f.bin
095d53d776903fa6419984b377c6dbcc0e1a349a89a40a3bbf8123d53ac97628
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 14476 bytes
font_02_sfnt_off00013bd5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 4324 bytes